657 lines
19 KiB
C++
657 lines
19 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2014 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or https://www.opensource.org/licenses/mit-license.php .
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#ifndef BITCOIN_NET_H
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#define BITCOIN_NET_H
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#include "bloom.h"
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#include "compat.h"
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#include "hash.h"
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#include "limitedmap.h"
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#include "mruset.h"
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#include "netbase.h"
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#include "protocol.h"
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#include "random.h"
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#include "streams.h"
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#include "sync.h"
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#include "uint256.h"
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#include "utilstrencodings.h"
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#include <deque>
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#include <stdint.h>
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#ifndef WIN32
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#include <arpa/inet.h>
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#endif
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#include <boost/filesystem/path.hpp>
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#include <boost/foreach.hpp>
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#include <boost/signals2/signal.hpp>
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class CAddrMan;
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class CBlockIndex;
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class CScheduler;
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class CNode;
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namespace boost {
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class thread_group;
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} // namespace boost
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/** Time between pings automatically sent out for latency probing and keepalive (in seconds). */
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static const int PING_INTERVAL = 2 * 60;
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/** Time after which to disconnect, after waiting for a ping response (or inactivity). */
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static const int TIMEOUT_INTERVAL = 20 * 60;
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/** The maximum number of entries in an 'inv' protocol message */
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static const unsigned int MAX_INV_SZ = 50000;
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/** The maximum number of new addresses to accumulate before announcing. */
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static const unsigned int MAX_ADDR_TO_SEND = 1000;
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/** Maximum length of incoming protocol messages (no message over 2 MiB is currently acceptable). */
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static const unsigned int MAX_PROTOCOL_MESSAGE_LENGTH = 2 * 1024 * 1024;
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/** Maximum length of strSubVer in `version` message */
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static const unsigned int MAX_SUBVERSION_LENGTH = 256;
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/** -listen default */
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static const bool DEFAULT_LISTEN = true;
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/** The maximum number of entries in mapAskFor */
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static const size_t MAPASKFOR_MAX_SZ = MAX_INV_SZ;
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/** The maximum number of entries in setAskFor (larger due to getdata latency)*/
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static const size_t SETASKFOR_MAX_SZ = 2 * MAX_INV_SZ;
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/** The maximum number of peer connections to maintain. */
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static const unsigned int DEFAULT_MAX_PEER_CONNECTIONS = 125;
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/** The period before a network upgrade activates, where connections to upgrading peers are preferred (in blocks). */
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static const int NETWORK_UPGRADE_PEER_PREFERENCE_BLOCK_PERIOD = 24 * 24 * 3;
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unsigned int ReceiveFloodSize();
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unsigned int SendBufferSize();
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void AddOneShot(const std::string& strDest);
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void AddressCurrentlyConnected(const CService& addr);
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CNode* FindNode(const CNetAddr& ip);
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CNode* FindNode(const CSubNet& subNet);
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CNode* FindNode(const std::string& addrName);
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CNode* FindNode(const CService& ip);
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CNode* ConnectNode(CAddress addrConnect, const char *pszDest = NULL);
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bool OpenNetworkConnection(const CAddress& addrConnect, CSemaphoreGrant *grantOutbound = NULL, const char *strDest = NULL, bool fOneShot = false);
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unsigned short GetListenPort();
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bool BindListenPort(const CService &bindAddr, std::string& strError, bool fWhitelisted = false);
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void StartNode(boost::thread_group& threadGroup, CScheduler& scheduler);
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bool StopNode();
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void SocketSendData(CNode *pnode);
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typedef int NodeId;
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struct CombinerAll
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{
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typedef bool result_type;
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template<typename I>
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bool operator()(I first, I last) const
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{
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while (first != last) {
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if (!(*first)) return false;
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++first;
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}
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return true;
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}
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};
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// Signals for message handling
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struct CNodeSignals
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{
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boost::signals2::signal<int ()> GetHeight;
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boost::signals2::signal<bool (CNode*), CombinerAll> ProcessMessages;
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boost::signals2::signal<bool (CNode*, bool), CombinerAll> SendMessages;
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boost::signals2::signal<void (NodeId, const CNode*)> InitializeNode;
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boost::signals2::signal<void (NodeId)> FinalizeNode;
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};
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CNodeSignals& GetNodeSignals();
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enum
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{
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LOCAL_NONE, // unknown
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LOCAL_IF, // address a local interface listens on
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LOCAL_BIND, // address explicit bound to
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LOCAL_UPNP, // unused (was: address reported by UPnP)
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LOCAL_MANUAL, // address explicitly specified (-externalip=)
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LOCAL_MAX
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};
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bool IsPeerAddrLocalGood(CNode *pnode);
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void AdvertizeLocal(CNode *pnode);
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void SetLimited(enum Network net, bool fLimited = true);
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bool IsLimited(enum Network net);
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bool IsLimited(const CNetAddr& addr);
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bool AddLocal(const CService& addr, int nScore = LOCAL_NONE);
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bool AddLocal(const CNetAddr& addr, int nScore = LOCAL_NONE);
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bool RemoveLocal(const CService& addr);
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bool SeenLocal(const CService& addr);
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bool IsLocal(const CService& addr);
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bool GetLocal(CService &addr, const CNetAddr *paddrPeer = NULL);
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bool IsReachable(enum Network net);
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bool IsReachable(const CNetAddr &addr);
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CAddress GetLocalAddress(const CNetAddr *paddrPeer = NULL);
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extern bool fDiscover;
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extern bool fListen;
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extern uint64_t nLocalServices;
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extern uint64_t nLocalHostNonce;
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extern CAddrMan addrman;
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/** Maximum number of connections to simultaneously allow (aka connection slots) */
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extern int nMaxConnections;
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extern std::vector<CNode*> vNodes;
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extern CCriticalSection cs_vNodes;
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extern std::map<CInv, CDataStream> mapRelay;
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extern std::deque<std::pair<int64_t, CInv> > vRelayExpiration;
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extern CCriticalSection cs_mapRelay;
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extern limitedmap<CInv, int64_t> mapAlreadyAskedFor;
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extern std::vector<std::string> vAddedNodes;
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extern CCriticalSection cs_vAddedNodes;
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extern NodeId nLastNodeId;
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extern CCriticalSection cs_nLastNodeId;
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/** Subversion as sent to the P2P network in `version` messages */
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extern std::string strSubVersion;
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struct LocalServiceInfo {
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int nScore;
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int nPort;
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};
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extern CCriticalSection cs_mapLocalHost;
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extern std::map<CNetAddr, LocalServiceInfo> mapLocalHost;
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class CNodeStats
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{
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public:
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NodeId nodeid;
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uint64_t nServices;
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int64_t nLastSend;
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int64_t nLastRecv;
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int64_t nTimeConnected;
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int64_t nTimeOffset;
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std::string addrName;
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int nVersion;
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std::string cleanSubVer;
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bool fInbound;
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int nStartingHeight;
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uint64_t nSendBytes;
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uint64_t nRecvBytes;
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bool fWhitelisted;
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double dPingTime;
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double dPingWait;
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std::string addrLocal;
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};
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class CNetMessage {
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public:
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bool in_data; // parsing header (false) or data (true)
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CDataStream hdrbuf; // partially received header
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CMessageHeader hdr; // complete header
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unsigned int nHdrPos;
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CDataStream vRecv; // received message data
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unsigned int nDataPos;
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int64_t nTime; // time (in microseconds) of message receipt.
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CNetMessage(const CMessageHeader::MessageStartChars& pchMessageStartIn, int nTypeIn, int nVersionIn) : hdrbuf(nTypeIn, nVersionIn), hdr(pchMessageStartIn), vRecv(nTypeIn, nVersionIn) {
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hdrbuf.resize(24);
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in_data = false;
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nHdrPos = 0;
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nDataPos = 0;
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nTime = 0;
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}
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bool complete() const
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{
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if (!in_data)
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return false;
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return (hdr.nMessageSize == nDataPos);
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}
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void SetVersion(int nVersionIn)
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{
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hdrbuf.SetVersion(nVersionIn);
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vRecv.SetVersion(nVersionIn);
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}
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int readHeader(const char *pch, unsigned int nBytes);
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int readData(const char *pch, unsigned int nBytes);
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};
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/** Information about a peer */
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class CNode
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{
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public:
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// socket
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uint64_t nServices;
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SOCKET hSocket;
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CDataStream ssSend;
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size_t nSendSize; // total size of all vSendMsg entries
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size_t nSendOffset; // offset inside the first vSendMsg already sent
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uint64_t nSendBytes;
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std::deque<CSerializeData> vSendMsg;
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CCriticalSection cs_vSend;
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std::deque<CInv> vRecvGetData;
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std::deque<CNetMessage> vRecvMsg;
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CCriticalSection cs_vRecvMsg;
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uint64_t nRecvBytes;
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int nRecvVersion;
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int64_t nLastSend;
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int64_t nLastRecv;
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int64_t nTimeConnected;
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int64_t nTimeOffset;
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CAddress addr;
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std::string addrName;
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CService addrLocal;
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int nVersion;
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// strSubVer is whatever byte array we read from the wire. However, this field is intended
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// to be printed out, displayed to humans in various forms and so on. So we sanitize it and
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// store the sanitized version in cleanSubVer. The original should be used when dealing with
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// the network or wire types and the cleaned string used when displayed or logged.
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std::string strSubVer, cleanSubVer;
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bool fWhitelisted; // This peer can bypass DoS banning.
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bool fOneShot;
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bool fClient;
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bool fInbound;
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bool fNetworkNode;
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bool fSuccessfullyConnected;
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bool fDisconnect;
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// We use fRelayTxes for two purposes -
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// a) it allows us to not relay tx invs before receiving the peer's version message
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// b) the peer may tell us in its version message that we should not relay tx invs
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// until it has initialized its bloom filter.
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bool fRelayTxes;
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bool fSentAddr;
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CSemaphoreGrant grantOutbound;
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CCriticalSection cs_filter;
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CBloomFilter* pfilter;
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int nRefCount;
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NodeId id;
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protected:
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// Denial-of-service detection/prevention
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// Key is IP address, value is banned-until-time
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static std::map<CSubNet, int64_t> setBanned;
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static CCriticalSection cs_setBanned;
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// Whitelisted ranges. Any node connecting from these is automatically
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// whitelisted (as well as those connecting to whitelisted binds).
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static std::vector<CSubNet> vWhitelistedRange;
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static CCriticalSection cs_vWhitelistedRange;
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// Basic fuzz-testing
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void Fuzz(int nChance); // modifies ssSend
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public:
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uint256 hashContinue;
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int nStartingHeight;
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// flood relay
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std::vector<CAddress> vAddrToSend;
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CRollingBloomFilter addrKnown;
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bool fGetAddr;
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std::set<uint256> setKnown;
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// inventory based relay
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mruset<CInv> setInventoryKnown;
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std::vector<CInv> vInventoryToSend;
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CCriticalSection cs_inventory;
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std::set<uint256> setAskFor;
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std::multimap<int64_t, CInv> mapAskFor;
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// Ping time measurement:
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// The pong reply we're expecting, or 0 if no pong expected.
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uint64_t nPingNonceSent;
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// Time (in usec) the last ping was sent, or 0 if no ping was ever sent.
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int64_t nPingUsecStart;
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// Last measured round-trip time.
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int64_t nPingUsecTime;
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// Best measured round-trip time.
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int64_t nMinPingUsecTime;
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// Whether a ping is requested.
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bool fPingQueued;
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CNode(SOCKET hSocketIn, const CAddress &addrIn, const std::string &addrNameIn = "", bool fInboundIn = false);
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~CNode();
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private:
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// Network usage totals
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static CCriticalSection cs_totalBytesRecv;
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static CCriticalSection cs_totalBytesSent;
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static uint64_t nTotalBytesRecv;
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static uint64_t nTotalBytesSent;
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CNode(const CNode&);
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void operator=(const CNode&);
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public:
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NodeId GetId() const {
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return id;
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}
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int GetRefCount()
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{
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assert(nRefCount >= 0);
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return nRefCount;
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}
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// requires LOCK(cs_vRecvMsg)
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unsigned int GetTotalRecvSize()
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{
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unsigned int total = 0;
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BOOST_FOREACH(const CNetMessage &msg, vRecvMsg)
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total += msg.vRecv.size() + 24;
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return total;
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}
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// requires LOCK(cs_vRecvMsg)
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bool ReceiveMsgBytes(const char *pch, unsigned int nBytes);
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// requires LOCK(cs_vRecvMsg)
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void SetRecvVersion(int nVersionIn)
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{
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nRecvVersion = nVersionIn;
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BOOST_FOREACH(CNetMessage &msg, vRecvMsg)
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msg.SetVersion(nVersionIn);
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}
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CNode* AddRef()
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{
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nRefCount++;
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return this;
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}
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void Release()
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{
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nRefCount--;
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}
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void AddAddressKnown(const CAddress& addr)
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{
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addrKnown.insert(addr.GetKey());
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}
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void PushAddress(const CAddress& addr)
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{
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// Known checking here is only to save space from duplicates.
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// SendMessages will filter it again for knowns that were added
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// after addresses were pushed.
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if (addr.IsValid() && !addrKnown.contains(addr.GetKey())) {
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if (vAddrToSend.size() >= MAX_ADDR_TO_SEND) {
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vAddrToSend[insecure_rand() % vAddrToSend.size()] = addr;
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} else {
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vAddrToSend.push_back(addr);
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}
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}
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}
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void AddInventoryKnown(const CInv& inv)
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{
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{
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LOCK(cs_inventory);
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setInventoryKnown.insert(inv);
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}
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}
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void PushInventory(const CInv& inv)
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{
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{
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LOCK(cs_inventory);
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if (!setInventoryKnown.count(inv))
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vInventoryToSend.push_back(inv);
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}
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}
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void AskFor(const CInv& inv);
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// TODO: Document the postcondition of this function. Is cs_vSend locked?
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void BeginMessage(const char* pszCommand) EXCLUSIVE_LOCK_FUNCTION(cs_vSend);
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// TODO: Document the precondition of this function. Is cs_vSend locked?
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void AbortMessage() UNLOCK_FUNCTION(cs_vSend);
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// TODO: Document the precondition of this function. Is cs_vSend locked?
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void EndMessage() UNLOCK_FUNCTION(cs_vSend);
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void PushVersion();
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void PushMessage(const char* pszCommand)
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{
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try
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{
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BeginMessage(pszCommand);
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EndMessage();
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}
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catch (...)
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{
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AbortMessage();
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throw;
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}
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}
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template<typename T1>
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void PushMessage(const char* pszCommand, const T1& a1)
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{
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try
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{
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BeginMessage(pszCommand);
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ssSend << a1;
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EndMessage();
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}
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catch (...)
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{
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AbortMessage();
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throw;
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}
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}
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template<typename T1, typename T2>
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void PushMessage(const char* pszCommand, const T1& a1, const T2& a2)
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{
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try
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{
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BeginMessage(pszCommand);
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ssSend << a1 << a2;
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EndMessage();
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}
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catch (...)
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{
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AbortMessage();
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throw;
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}
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}
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template<typename T1, typename T2, typename T3>
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void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3)
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{
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try
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{
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BeginMessage(pszCommand);
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ssSend << a1 << a2 << a3;
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EndMessage();
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}
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catch (...)
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{
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AbortMessage();
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throw;
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}
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}
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template<typename T1, typename T2, typename T3, typename T4>
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void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4)
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{
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try
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{
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BeginMessage(pszCommand);
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ssSend << a1 << a2 << a3 << a4;
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EndMessage();
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}
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catch (...)
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{
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AbortMessage();
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throw;
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}
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}
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template<typename T1, typename T2, typename T3, typename T4, typename T5>
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void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5)
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{
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try
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{
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BeginMessage(pszCommand);
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ssSend << a1 << a2 << a3 << a4 << a5;
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EndMessage();
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}
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catch (...)
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{
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AbortMessage();
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throw;
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}
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}
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template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6>
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void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6)
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{
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try
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{
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BeginMessage(pszCommand);
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ssSend << a1 << a2 << a3 << a4 << a5 << a6;
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EndMessage();
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}
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catch (...)
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{
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|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7>
|
|
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8>
|
|
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
template<typename T1, typename T2, typename T3, typename T4, typename T5, typename T6, typename T7, typename T8, typename T9>
|
|
void PushMessage(const char* pszCommand, const T1& a1, const T2& a2, const T3& a3, const T4& a4, const T5& a5, const T6& a6, const T7& a7, const T8& a8, const T9& a9)
|
|
{
|
|
try
|
|
{
|
|
BeginMessage(pszCommand);
|
|
ssSend << a1 << a2 << a3 << a4 << a5 << a6 << a7 << a8 << a9;
|
|
EndMessage();
|
|
}
|
|
catch (...)
|
|
{
|
|
AbortMessage();
|
|
throw;
|
|
}
|
|
}
|
|
|
|
void CloseSocketDisconnect();
|
|
|
|
// Denial-of-service detection/prevention
|
|
// The idea is to detect peers that are behaving
|
|
// badly and disconnect/ban them, but do it in a
|
|
// one-coding-mistake-won't-shatter-the-entire-network
|
|
// way.
|
|
// IMPORTANT: There should be nothing I can give a
|
|
// node that it will forward on that will make that
|
|
// node's peers drop it. If there is, an attacker
|
|
// can isolate a node and/or try to split the network.
|
|
// Dropping a node for sending stuff that is invalid
|
|
// now but might be valid in a later version is also
|
|
// dangerous, because it can cause a network split
|
|
// between nodes running old code and nodes running
|
|
// new code.
|
|
static void ClearBanned(); // needed for unit testing
|
|
static bool IsBanned(CNetAddr ip);
|
|
static bool IsBanned(CSubNet subnet);
|
|
static void Ban(const CNetAddr &ip, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
|
|
static void Ban(const CSubNet &subNet, int64_t bantimeoffset = 0, bool sinceUnixEpoch = false);
|
|
static bool Unban(const CNetAddr &ip);
|
|
static bool Unban(const CSubNet &ip);
|
|
static void GetBanned(std::map<CSubNet, int64_t> &banmap);
|
|
|
|
void copyStats(CNodeStats &stats);
|
|
|
|
static bool IsWhitelistedRange(const CNetAddr &ip);
|
|
static void AddWhitelistedRange(const CSubNet &subnet);
|
|
|
|
// Network stats
|
|
static void RecordBytesRecv(uint64_t bytes);
|
|
static void RecordBytesSent(uint64_t bytes);
|
|
|
|
static uint64_t GetTotalBytesRecv();
|
|
static uint64_t GetTotalBytesSent();
|
|
};
|
|
|
|
|
|
|
|
class CTransaction;
|
|
void RelayTransaction(const CTransaction& tx);
|
|
void RelayTransaction(const CTransaction& tx, const CDataStream& ss);
|
|
|
|
/** Access to the (IP) address database (peers.dat) */
|
|
class CAddrDB
|
|
{
|
|
private:
|
|
boost::filesystem::path pathAddr;
|
|
public:
|
|
CAddrDB();
|
|
bool Write(const CAddrMan& addr);
|
|
bool Read(CAddrMan& addr);
|
|
};
|
|
|
|
#endif // BITCOIN_NET_H
|